South Korean soldiers inspect a visitor at a Security checkpoint as they replace security guards showing symptoms of the norovirus at the Gangneung Ice Arena in Gangneung on February 6, 2018 ahead of the Pyeongchang 2018 Winter Olympic Games.

As CBS News correspondent Ben Tracy reported on Monday, South Korea has mobilized an Olympic security force of more than 60,000 people, including 50,000 soldiers.

When Pyeongchang was awarded the 2018 Winter Olympic Games more than seven years ago, tensions in the region were much lower and North Korea did not have missiles thought capable of hitting the United States.

But the situation on the Korean peninsula now is very different, and security concerns involve everything from terrorism to war.

South Korea's government reportedly has banned 36,000 foreigners from entering the country for the Winter Olympics, because of security issues.